package com.android.launcher2;
import java.lang.ref.WeakReference;
import java.net.URISyntaxException;
import java.text.Collator;
import java.util.ArrayList;
import java.util.Collections;
import java.util.Comparator;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;

import android.annotation.SuppressLint;
import android.app.SearchManager;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProviderInfo;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.ContentProviderClient;
import android.content.ContentResolver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.Intent.ShortcutIconResource;
import android.content.pm.ActivityInfo;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.ResolveInfo;
import android.content.res.Configuration;
import android.content.res.Resources;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.os.Environment;
import android.os.Handler;
import android.os.HandlerThread;
import android.os.Parcelable;
import android.os.Process;
import android.os.RemoteException;
import android.os.SystemClock;
import android.util.Log;

import com.george.launcher.R;
import com.android.launcher2.InstallWidgetReceiver.WidgetMimeTypeHandlerData;

public class LauncherModel extends BroadcastReceiver {
    static final boolean DEBUG_LOADERS = true;
    static final String TAG = "Launcher.Model";

    private static final int ITEMS_CHUNK = 6; // batch size for the workspace icons
    private final boolean mAppsCanBeOnExternalStorage;
    private int mBatchSize;  // 0 is all apps at once
    private int mAllAppsLoadDelay; // milliseconds between batches

    private final LauncherApplication mApp;   
    private final Object mLock = new Object();
    private DeferredHandler mHandler = new DeferredHandler();
    private LoaderTask mLoaderTask;
    private boolean mIsLoaderTaskRunning;

    // Specific runnable types that are run on the main thread deferred handler, this allows us to clear all queued binding runnables when the Launcher activity is destroyed. 
    private static final int MAIN_THREAD_NORMAL_RUNNABLE = 0;
    private static final int MAIN_THREAD_BINDING_RUNNABLE = 1;


    private static final HandlerThread sWorkerThread = new HandlerThread("launcher-loader");
    static {
        sWorkerThread.start();
    }
    private static final Handler sWorker = new Handler(sWorkerThread.getLooper());

    // We start off with everything not loaded.  After that, we assume that our monitoring of the package manager provides all updates and we never need to do a requery.  These are only ever touched from the loader thread.
    private boolean mWorkspaceLoaded;
    private boolean mAllAppsLoaded;

    // When we are loading pages synchronously, we can't just post the binding of items on the side pages as this delays the rotation process.  Instead, we wait for a callback from the first draw (in Workspace) to initiate the binding of the remaining side pages.  Any time we start a normal load, we also clear this set of Runnables.
    static final ArrayList<Runnable> mDeferredBindRunnables = new ArrayList<Runnable>();

    private WeakReference<Callbacks> mCallbacks;

    // < only access in worker thread >
    private AllAppsList mBgAllAppsList;

    // The lock that must be acquired before referencing any static bg data structures.  Unlike other locks, this one can generally be held long-term because we never expect any of these static data structures to be referenced outside of the worker thread except on the first load after configuration change.
    static final Object sBgLock = new Object();

    // sBgItemsIdMap maps *all* the ItemInfos (shortcuts, folders, and widgets) created by LauncherModel to their ids
    static final HashMap<Long, ItemInfo> sBgItemsIdMap = new HashMap<Long, ItemInfo>();

    // sBgWorkspaceItems is passed to bindItems, which expects a list of all folders and shortcuts created by LauncherModel that are directly on the home screen (however, no widgets or shortcuts within folders).
    static final ArrayList<ItemInfo> sBgWorkspaceItems = new ArrayList<ItemInfo>();

    // sBgAppWidgets is all LauncherAppWidgetInfo created by LauncherModel. Passed to bindAppWidget()
    static final ArrayList<LauncherAppWidgetInfo> sBgAppWidgets = new ArrayList<LauncherAppWidgetInfo>();

    // sBgFolders is all FolderInfos created by LauncherModel. Passed to bindFolders()
    static final HashMap<Long, FolderInfo> sBgFolders = new HashMap<Long, FolderInfo>(); 

    // sBgDbIconCache is the set of ItemInfos that need to have their icons updated in the database
    static final HashMap<Object, byte[]> sBgDbIconCache = new HashMap<Object, byte[]>();
    
    // </ only access in worker thread >
    private IconCache mIconCache;
    private Bitmap mDefaultIcon;
    private static int mCellCountX;
    private static int mCellCountY;
    protected int mPreviousConfigMcc;

    public interface Callbacks {
        public boolean setLoadOnResume();
        public int getCurrentWorkspaceScreen();
        public void startBinding();
        public void bindItems(ArrayList<ItemInfo> shortcuts, int start, int end);
        public void bindFolders(HashMap<Long,FolderInfo> folders);
        public void finishBindingItems();
        public void bindAppWidget(LauncherAppWidgetInfo info);
        public void bindAllApplications(ArrayList<ApplicationInfo> apps);
        public void bindAppsAdded(ArrayList<ApplicationInfo> apps);
        public void bindAppsUpdated(ArrayList<ApplicationInfo> apps);
        public void bindAppsRemoved(ArrayList<String> packageNames, boolean permanent);
        public void bindPackagesUpdated();
        public boolean isAllAppsVisible();
        public boolean isAllAppsButtonRank(int rank);
        public void bindSearchablesChanged();
        public void onPageBoundSynchronously(int page);
    }

    LauncherModel(LauncherApplication app, IconCache iconCache) {
        mAppsCanBeOnExternalStorage = !Environment.isExternalStorageEmulated();
        mApp = app;
        mBgAllAppsList = new AllAppsList(iconCache);
        mIconCache = iconCache;
        mDefaultIcon = Utilities.createIconBitmap(mIconCache.getFullResDefaultActivityIcon(), app);
        final Resources res = app.getResources();
        mAllAppsLoadDelay = res.getInteger(R.integer.config_allAppsBatchLoadDelay);
        mBatchSize = res.getInteger(R.integer.config_allAppsBatchSize);
        Configuration config = res.getConfiguration();
        mPreviousConfigMcc = config.mcc;
    }

    /** Runs the specified runnable immediately if called from the main thread, otherwise it is posted on the main thread handler. */
    private void runOnMainThread(Runnable r) {
        runOnMainThread(r, 0);
    }
    private void runOnMainThread(Runnable r, int type) {
        if (sWorkerThread.getThreadId() == Process.myTid()) {
            // If we are on the worker thread, post onto the main handler
            mHandler.post(r);
        } else {
            r.run();
        }
    }

    /** Runs the specified runnable immediately if called from the worker thread, otherwise it is posted on the worker thread handler. */
    private static void runOnWorkerThread(Runnable r) {
        if (sWorkerThread.getThreadId() == Process.myTid()) {
            r.run();
        } else {
            // If we are not on the worker thread, then post to the worker handler
            sWorker.post(r);
        }
    }

    public Bitmap getFallbackIcon() {
        return Bitmap.createBitmap(mDefaultIcon);
    }

    public void unbindItemInfosAndClearQueuedBindRunnables() {
        if (sWorkerThread.getThreadId() == Process.myTid()) {
            throw new RuntimeException("Expected unbindLauncherItemInfos() to be called from the " + "main thread");
        }
        // Clear any deferred bind runnables
        mDeferredBindRunnables.clear();
        // Remove any queued bind runnables
        mHandler.cancelAllRunnablesOfType(MAIN_THREAD_BINDING_RUNNABLE);
        // Unbind all the workspace items
        unbindWorkspaceItemsOnMainThread();
    }

    /** Unbinds all the sBgWorkspaceItems and sBgAppWidgets on the main thread */
    void unbindWorkspaceItemsOnMainThread() {
        // Ensure that we don't use the same workspace items data structure on the main thread by making a copy of workspace items first.
        final ArrayList<ItemInfo> tmpWorkspaceItems = new ArrayList<ItemInfo>();
        final ArrayList<ItemInfo> tmpAppWidgets = new ArrayList<ItemInfo>();
        synchronized (sBgLock) {
            tmpWorkspaceItems.addAll(sBgWorkspaceItems);
            tmpAppWidgets.addAll(sBgAppWidgets);
        }
        Runnable r = new Runnable() {
                @Override
                public void run() {
                   for (ItemInfo item : tmpWorkspaceItems) {
                       item.unbind();
                   }
                   for (ItemInfo item : tmpAppWidgets) {
                       item.unbind();
                   }
                }
            };
        runOnMainThread(r);
    }

    /** Adds an item to the DB if it was not created previously, or move it to a new <container, screen, cellX, cellY> */
    static void addOrMoveItemInDatabase(Context context, ItemInfo item, long container, int screen, int cellX, int cellY) {
        if (item.container == ItemInfo.NO_ID) {
            // From all apps
            addItemToDatabase(context, item, container, screen, cellX, cellY, false);
        } else {
            // From somewhere else
            moveItemInDatabase(context, item, container, screen, cellX, cellY);
        }
    }

    static void checkItemInfoLocked(final long itemId, final ItemInfo item, StackTraceElement[] stackTrace) {
        ItemInfo modelItem = sBgItemsIdMap.get(itemId);
        if (modelItem != null && item != modelItem) {
            // check all the data is consistent
            if (modelItem instanceof ShortcutInfo && item instanceof ShortcutInfo) {
                ShortcutInfo modelShortcut = (ShortcutInfo) modelItem;
                ShortcutInfo shortcut = (ShortcutInfo) item;
                if (modelShortcut.title.toString().equals(shortcut.title.toString()) && modelShortcut.intent.filterEquals(shortcut.intent) && modelShortcut.id == shortcut.id && modelShortcut.itemType == shortcut.itemType && modelShortcut.container == shortcut.container &&
                        modelShortcut.screen == shortcut.screen && modelShortcut.cellX == shortcut.cellX && modelShortcut.cellY == shortcut.cellY && modelShortcut.spanX == shortcut.spanX &&
                        modelShortcut.spanY == shortcut.spanY && ((modelShortcut.dropPos == null && shortcut.dropPos == null) || (modelShortcut.dropPos != null && shortcut.dropPos != null && modelShortcut.dropPos[0] == shortcut.dropPos[0] && modelShortcut.dropPos[1] == shortcut.dropPos[1]))) {
                    // For all intents and purposes, this is the same object
                    return;
                }
            }

            // the modelItem needs to match up perfectly with item if our model is to be consistent with the database-- for now, just require modelItem == item or the equality check above
            String msg = "item: " + ((item != null) ? item.toString() : "null") + "modelItem: " + ((modelItem != null) ? modelItem.toString() : "null") + "Error: ItemInfo passed to checkItemInfo doesn't match original";
            RuntimeException e = new RuntimeException(msg);
            if (stackTrace != null) {
                e.setStackTrace(stackTrace);
            }
            throw e;
        }
    }

    static void checkItemInfo(final ItemInfo item) {
        final StackTraceElement[] stackTrace = new Throwable().getStackTrace();
        final long itemId = item.id;
        Runnable r = new Runnable() {
            public void run() {
                synchronized (sBgLock) {
                    checkItemInfoLocked(itemId, item, stackTrace);
                }
            }
        };
        runOnWorkerThread(r);
    }

    static void updateItemInDatabaseHelper(Context context, final ContentValues values, final ItemInfo item, final String callingFunction) {
        final long itemId = item.id;
        final Uri uri = LauncherSettings.Favorites.getContentUri(itemId, false);
        final ContentResolver cr = context.getContentResolver();

        final StackTraceElement[] stackTrace = new Throwable().getStackTrace();
        Runnable r = new Runnable() {
            public void run() {
                cr.update(uri, values, null, null);
                // Lock on mBgLock *after* the db operation
                synchronized (sBgLock) {
                    checkItemInfoLocked(itemId, item, stackTrace);
                    if (item.container != LauncherSettings.Favorites.CONTAINER_DESKTOP &&
                            item.container != LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                        // Item is in a folder, make sure this folder exists
                        if (!sBgFolders.containsKey(item.container)) {
                            // An items container is being set to a that of an item which is not in the list of Folders.
                            String msg = "item: " + item + " container being set to: " + item.container + ", not in the list of folders";
                            Log.e(TAG, msg);
//                            Launcher.dumpDebugLogsToConsole();
                        }
                    }

                    // Items are added/removed from the corresponding FolderInfo elsewhere, such as in Workspace.onDrop. Here, we just add/remove them from the list of items that are on the desktop, as appropriate
                    ItemInfo modelItem = sBgItemsIdMap.get(itemId);
                    if (modelItem.container == LauncherSettings.Favorites.CONTAINER_DESKTOP || modelItem.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                        switch (modelItem.itemType) {
                            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                                if (!sBgWorkspaceItems.contains(modelItem)) {
                                    sBgWorkspaceItems.add(modelItem);
                                }
                                break;
                            default:
                                break;
                        }
                    } else {
                        sBgWorkspaceItems.remove(modelItem);
                    }
                }
            }
        };
        runOnWorkerThread(r);
    }

    /***  Move an item in the DB to a new <container, screen, cellX, cellY>  */
    static void moveItemInDatabase(Context context, final ItemInfo item, final long container, final int screen, final int cellX, final int cellY) {
        String transaction = "DbDebug    Modify item (" + item.title + ") in db, id: " + item.id + " (" + item.container + ", " + item.screen + ", " + item.cellX + ", " + item.cellY + ") --> " + "(" + container + ", " + screen + ", " + cellX + ", " + cellY + ")";
        Launcher.sDumpLogs.add(transaction);
        Log.d(TAG, transaction);
        item.container = container;
        item.cellX = cellX;
        item.cellY = cellY;
        // We store hotseat items in canonical form which is this orientation invariant position in the hotseat
        if (context instanceof Launcher && screen < 0 && container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
            item.screen = ((Launcher) context).getHotseat().getOrderInHotseat(cellX, cellY);
        } else {
            item.screen = screen;
        }
        final ContentValues values = new ContentValues();
        values.put(LauncherSettings.Favorites.CONTAINER, item.container);
        values.put(LauncherSettings.Favorites.CELLX, item.cellX);
        values.put(LauncherSettings.Favorites.CELLY, item.cellY);
        values.put(LauncherSettings.Favorites.SCREEN, item.screen);
        updateItemInDatabaseHelper(context, values, item, "moveItemInDatabase");
    }

    /***  Move and/or resize item in the DB to a new <container, screen, cellX, cellY, spanX, spanY>  */
    static void modifyItemInDatabase(Context context, final ItemInfo item, final long container, final int screen, final int cellX, final int cellY, final int spanX, final int spanY) {
        String transaction = "DbDebug    Modify item (" + item.title + ") in db, id: " + item.id + " (" + item.container + ", " + item.screen + ", " + item.cellX + ", " + item.cellY + ") --> " + "(" + container + ", " + screen + ", " + cellX + ", " + cellY + ")";
        Launcher.sDumpLogs.add(transaction);
        Log.d(TAG, transaction);
        item.cellX = cellX;
        item.cellY = cellY;
        item.spanX = spanX;
        item.spanY = spanY;
        // We store hotseat items in canonical form which is this orientation invariant position in the hotseat
        if (context instanceof Launcher && screen < 0 && container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
            item.screen = ((Launcher) context).getHotseat().getOrderInHotseat(cellX, cellY);
        } else {
            item.screen = screen;
        }
        final ContentValues values = new ContentValues();
        values.put(LauncherSettings.Favorites.CONTAINER, item.container);
        values.put(LauncherSettings.Favorites.CELLX, item.cellX);
        values.put(LauncherSettings.Favorites.CELLY, item.cellY);
        values.put(LauncherSettings.Favorites.SPANX, item.spanX);
        values.put(LauncherSettings.Favorites.SPANY, item.spanY);
        values.put(LauncherSettings.Favorites.SCREEN, item.screen);
        updateItemInDatabaseHelper(context, values, item, "modifyItemInDatabase");
    }

    /**
     * Update an item to the database in a specified container.
     */
    static void updateItemInDatabase(Context context, final ItemInfo item) {
        final ContentValues values = new ContentValues();
        item.onAddToDatabase(values);
        item.updateValuesWithCoordinates(values, item.cellX, item.cellY);
        updateItemInDatabaseHelper(context, values, item, "updateItemInDatabase");
    }

    /** Returns true if the shortcuts already exists in the database. we identify a shortcut by its title and intent. */
    static boolean shortcutExists(Context context, String title, Intent intent) {
        final ContentResolver cr = context.getContentResolver();
        Cursor c = cr.query(LauncherSettings.Favorites.CONTENT_URI, new String[] { "title", "intent" }, "title=? and intent=?", new String[] { title, intent.toUri(0) }, null);
        boolean result = false;
        try {
            result = c.moveToFirst();
        } finally {
            c.close();
        }
        return result;
    }

    /**  Returns an ItemInfo array containing all the items in the LauncherModel. The ItemInfo.id is not set through this function.  */
    static ArrayList<ItemInfo> getItemsInLocalCoordinates(Context context) {
        ArrayList<ItemInfo> items = new ArrayList<ItemInfo>();
        final ContentResolver cr = context.getContentResolver();
        Cursor c = cr.query(LauncherSettings.Favorites.CONTENT_URI, new String[] { LauncherSettings.Favorites.ITEM_TYPE, LauncherSettings.Favorites.CONTAINER, LauncherSettings.Favorites.SCREEN, LauncherSettings.Favorites.CELLX, LauncherSettings.Favorites.CELLY, LauncherSettings.Favorites.SPANX, LauncherSettings.Favorites.SPANY }, null, null, null);
        final int itemTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ITEM_TYPE);
        final int containerIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CONTAINER);
        final int screenIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SCREEN);
        final int cellXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLX);
        final int cellYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLY);
        final int spanXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANX);
        final int spanYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANY);

        try {
            while (c.moveToNext()) {
                ItemInfo item = new ItemInfo();
                item.cellX = c.getInt(cellXIndex);
                item.cellY = c.getInt(cellYIndex);
                item.spanX = c.getInt(spanXIndex);
                item.spanY = c.getInt(spanYIndex);
                item.container = c.getInt(containerIndex);
                item.itemType = c.getInt(itemTypeIndex);
                item.screen = c.getInt(screenIndex);
                items.add(item);
            }
        } catch (Exception e) {
            items.clear();
        } finally {
            c.close();
        }
        return items;
    }

    /*** Find a folder in the db, creating the FolderInfo if necessary, and adding it to folderList.  */
    FolderInfo getFolderById(Context context, HashMap<Long,FolderInfo> folderList, long id) {
        final ContentResolver cr = context.getContentResolver();
        Cursor c = cr.query(LauncherSettings.Favorites.CONTENT_URI, null, "_id=? and (itemType=? or itemType=?)", new String[] { String.valueOf(id), String.valueOf(LauncherSettings.Favorites.ITEM_TYPE_FOLDER)}, null);
        try {
            if (c.moveToFirst()) {
                final int itemTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ITEM_TYPE);
                final int titleIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.TITLE);
                final int containerIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CONTAINER);
                final int screenIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SCREEN);
                final int cellXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLX);
                final int cellYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLY);

                FolderInfo folderInfo = null;
                switch (c.getInt(itemTypeIndex)) {
                    case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                        folderInfo = findOrMakeFolder(folderList, id);
                        break;
                }

                folderInfo.title = c.getString(titleIndex);
                folderInfo.id = id;
                folderInfo.container = c.getInt(containerIndex);
                folderInfo.screen = c.getInt(screenIndex);
                folderInfo.cellX = c.getInt(cellXIndex);
                folderInfo.cellY = c.getInt(cellYIndex);

                return folderInfo;
            }
        } finally {
            c.close();
        }
        return null;
    }

    /*** Add an item to the database in a specified container. Sets the container, screen, cellX and cellY fields of the item. Also assigns an ID to the item.  */
    static void addItemToDatabase(Context context, final ItemInfo item, final long container, final int screen, final int cellX, final int cellY, final boolean notify) {
        item.container = container;
        item.cellX = cellX;
        item.cellY = cellY;
        // We store hotseat items in canonical form which is this orientation invariant position in the hotseat
        if (context instanceof Launcher && screen < 0 && container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
            item.screen = ((Launcher) context).getHotseat().getOrderInHotseat(cellX, cellY);
        } else {
            item.screen = screen;
        }

        final ContentValues values = new ContentValues();
        final ContentResolver cr = context.getContentResolver();
        item.onAddToDatabase(values);

        LauncherApplication app = (LauncherApplication) context.getApplicationContext();
        item.id = app.getLauncherProvider().generateNewId();
        values.put(LauncherSettings.Favorites._ID, item.id);
        item.updateValuesWithCoordinates(values, item.cellX, item.cellY);

        Runnable r = new Runnable() {
            public void run() {
                String transaction = "DbDebug    Add item (" + item.title + ") to db, id: " + item.id + " (" + container + ", " + screen + ", " + cellX + ", " + cellY + ")";
                Launcher.sDumpLogs.add(transaction);
                Log.d(TAG, transaction);

                cr.insert(notify ? LauncherSettings.Favorites.CONTENT_URI : LauncherSettings.Favorites.CONTENT_URI_NO_NOTIFICATION, values);

                // Lock on mBgLock *after* the db operation
                synchronized (sBgLock) {
                    checkItemInfoLocked(item.id, item, null);
                    sBgItemsIdMap.put(item.id, item);
                    switch (item.itemType) {
                        case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                            sBgFolders.put(item.id, (FolderInfo) item);
                            // Fall through
                        case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                        case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                            if (item.container == LauncherSettings.Favorites.CONTAINER_DESKTOP || item.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                                sBgWorkspaceItems.add(item);
                            } else {
                                if (!sBgFolders.containsKey(item.container)) {
                                    // Adding an item to a folder that doesn't exist.
                                    String msg = "adding item: " + item + " to a folder that " + " doesn't exist";
                                    Log.e(TAG, msg);
//                                    Launcher.dumpDebugLogsToConsole();
                                }
                            }
                            break;
                        case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
                            sBgAppWidgets.add((LauncherAppWidgetInfo) item);
                            break;
                    }
                }
            }
        };
        runOnWorkerThread(r);
    }

    /*** Creates a new unique child id, for a given cell span across all layouts.  */
    static int getCellLayoutChildId(long container, int screen, int localCellX, int localCellY, int spanX, int spanY) {
        return (((int) container & 0xFF) << 24) | (screen & 0xFF) << 16 | (localCellX & 0xFF) << 8 | (localCellY & 0xFF);
    }

    static int getCellCountX() {
        return mCellCountX;
    }

    static int getCellCountY() {
        return mCellCountY;
    }

    /** Updates the model orientation helper to take into account the current layout dimensions when performing local/canonical coordinate transformations. */
    static void updateWorkspaceLayoutCells(int shortAxisCellCount, int longAxisCellCount) {
        mCellCountX = shortAxisCellCount;
        mCellCountY = longAxisCellCount;
    }

    /**
     * Removes the specified item from the database
     * @param context
     * @param item
     */
    static void deleteItemFromDatabase(Context context, final ItemInfo item) {
        final ContentResolver cr = context.getContentResolver();
        final Uri uriToDelete = LauncherSettings.Favorites.getContentUri(item.id, false);

        Runnable r = new Runnable() {
            public void run() {
                String transaction = "DbDebug    Delete item (" + item.title + ") from db, id: " + item.id + " (" + item.container + ", " + item.screen + ", " + item.cellX + ", " + item.cellY + ")";
                Launcher.sDumpLogs.add(transaction);
                Log.d(TAG, transaction);

                cr.delete(uriToDelete, null, null);

                // Lock on mBgLock *after* the db operation
                synchronized (sBgLock) {
                    switch (item.itemType) {
                        case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                            sBgFolders.remove(item.id);
                            for (ItemInfo info: sBgItemsIdMap.values()) {
                                if (info.container == item.id) {
                                    // We are deleting a folder which still contains items that think they are contained by that folder.
                                    String msg = "deleting a folder (" + item + ") which still " + "contains items (" + info + ")";
                                    Log.e(TAG, msg);
//                                    Launcher.dumpDebugLogsToConsole();
                                }
                            }
                            sBgWorkspaceItems.remove(item);
                            break;
                        case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                        case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                            sBgWorkspaceItems.remove(item);
                            break;
                        case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
                            sBgAppWidgets.remove((LauncherAppWidgetInfo) item);
                            break;
                    }
                    sBgItemsIdMap.remove(item.id);
                    sBgDbIconCache.remove(item);
                }
            }
        };
        runOnWorkerThread(r);
    }

    /*** Remove the contents of the specified folder from the database */
    static void deleteFolderContentsFromDatabase(Context context, final FolderInfo info) {
        final ContentResolver cr = context.getContentResolver();
        Runnable r = new Runnable() {
            public void run() {
                cr.delete(LauncherSettings.Favorites.getContentUri(info.id, false), null, null);
                // Lock on mBgLock *after* the db operation
                synchronized (sBgLock) {
                    sBgItemsIdMap.remove(info.id);
                    sBgFolders.remove(info.id);
                    sBgDbIconCache.remove(info);
                    sBgWorkspaceItems.remove(info);
                }

                cr.delete(LauncherSettings.Favorites.CONTENT_URI_NO_NOTIFICATION, LauncherSettings.Favorites.CONTAINER + "=" + info.id, null);
                // Lock on mBgLock *after* the db operation
                synchronized (sBgLock) {
                    for (ItemInfo childInfo : info.contents) {
                        sBgItemsIdMap.remove(childInfo.id);
                        sBgDbIconCache.remove(childInfo);
                    }
                }
            }
        };
        runOnWorkerThread(r);
    }

    /***  Set this as the current Launcher activity object for the loader. */
    public void initialize(Callbacks callbacks) {
        synchronized (mLock) {
            mCallbacks = new WeakReference<Callbacks>(callbacks);
        }
    }

    /** Call from the handler for ACTION_PACKAGE_ADDED, ACTION_PACKAGE_REMOVED and ACTION_PACKAGE_CHANGED. */
    @Override
    public void onReceive(Context context, Intent intent) {
//        if (DEBUG_LOADERS) Log.d(TAG, "onReceive intent=" + intent);
        final String action = intent.getAction();

        if (Intent.ACTION_PACKAGE_CHANGED.equals(action) || Intent.ACTION_PACKAGE_REMOVED.equals(action) || Intent.ACTION_PACKAGE_ADDED.equals(action)) {
            final String packageName = intent.getData().getSchemeSpecificPart();
            final boolean replacing = intent.getBooleanExtra(Intent.EXTRA_REPLACING, false);

            int op = PackageUpdatedTask.OP_NONE;

            if (packageName == null || packageName.length() == 0) {
                // they sent us a bad intent
                return;
            }

            if (Intent.ACTION_PACKAGE_CHANGED.equals(action)) {
                op = PackageUpdatedTask.OP_UPDATE;
            } else if (Intent.ACTION_PACKAGE_REMOVED.equals(action)) {
                if (!replacing) {
                    op = PackageUpdatedTask.OP_REMOVE;
                }
                // else, we are replacing the package, so a PACKAGE_ADDED will be sent later, we will update the package at this time
            } else if (Intent.ACTION_PACKAGE_ADDED.equals(action)) {
                if (!replacing) {
                    op = PackageUpdatedTask.OP_ADD;
                } else {
                    op = PackageUpdatedTask.OP_UPDATE;
                }
            }

            if (op != PackageUpdatedTask.OP_NONE) {
                enqueuePackageUpdated(new PackageUpdatedTask(op, new String[] { packageName }));
            }

        } else if (Intent.ACTION_EXTERNAL_APPLICATIONS_AVAILABLE.equals(action)) {
            // First, schedule to add these apps back in.
            String[] packages = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
            enqueuePackageUpdated(new PackageUpdatedTask(PackageUpdatedTask.OP_ADD, packages));
            // Then, rebind everything.
            startLoaderFromBackground();
        } else if (Intent.ACTION_EXTERNAL_APPLICATIONS_UNAVAILABLE.equals(action)) {
            String[] packages = intent.getStringArrayExtra(Intent.EXTRA_CHANGED_PACKAGE_LIST);
            enqueuePackageUpdated(new PackageUpdatedTask(PackageUpdatedTask.OP_UNAVAILABLE, packages));
        } else if (Intent.ACTION_LOCALE_CHANGED.equals(action)) {
            // If we have changed locale we need to clear out the labels in all apps/workspace.
            forceReload();
        } else if (Intent.ACTION_CONFIGURATION_CHANGED.equals(action)) {
             // Check if configuration change was an mcc/mnc change which would affect app resources and we would need to clear out the labels in all apps/workspace. Same handling as above for ACTION_LOCALE_CHANGED
             Configuration currentConfig = context.getResources().getConfiguration();
             if (mPreviousConfigMcc != currentConfig.mcc) {
                   Log.d(TAG, "Reload apps on config change. curr_mcc:" + currentConfig.mcc + " prevmcc:" + mPreviousConfigMcc);
                   forceReload();
             }
             // Update previousConfig
             mPreviousConfigMcc = currentConfig.mcc;
        } else if (SearchManager.INTENT_GLOBAL_SEARCH_ACTIVITY_CHANGED.equals(action) || SearchManager.INTENT_ACTION_SEARCHABLES_CHANGED.equals(action)) {
            if (mCallbacks != null) {
                Callbacks callbacks = mCallbacks.get();
                if (callbacks != null) {
                    callbacks.bindSearchablesChanged();
                }
            }
        }
    }

    private void forceReload() {
        resetLoadedState(true, true);
        // Do this here because if the launcher activity is running it will be restarted. If it's not running startLoaderFromBackground will merely tell it that it needs to reload.
        startLoaderFromBackground();
    }

    public void resetLoadedState(boolean resetAllAppsLoaded, boolean resetWorkspaceLoaded) {
        synchronized (mLock) {
            // Stop any existing loaders first, so they don't set mAllAppsLoaded or mWorkspaceLoaded to true later
            stopLoaderLocked();
            if (resetAllAppsLoaded) mAllAppsLoaded = false;
            if (resetWorkspaceLoaded) mWorkspaceLoaded = false;
        }
    }

    /** When the launcher is in the background, it's possible for it to miss paired configuration changes.  So whenever we trigger the loader from the background tell the launcher that it needs to re-run the loader when it comes back instead of doing it now.*/
    public void startLoaderFromBackground() {
        boolean runLoader = false;
        if (mCallbacks != null) {
            Callbacks callbacks = mCallbacks.get();
            if (callbacks != null) {
                // Only actually run the loader if they're not paused.
                if (!callbacks.setLoadOnResume()) {
                    runLoader = true;
                }
            }
        }
        if (runLoader) {
            startLoader(false, -1);
        }
    }

    // If there is already a loader task running, tell it to stop. returns true if isLaunching() was true on the old task
    private boolean stopLoaderLocked() {
        boolean isLaunching = false;
        LoaderTask oldTask = mLoaderTask;
        if (oldTask != null) {
            if (oldTask.isLaunching()) {
                isLaunching = true;
            }
            oldTask.stopLocked();
        }
        return isLaunching;
    }

    public void startLoader(boolean isLaunching, int synchronousBindPage) {
        synchronized (mLock) {
            if (DEBUG_LOADERS) {
                Log.d(TAG, "startLoader isLaunching=" + isLaunching);
            }

            // Clear any deferred bind-runnables from the synchronized load process We must do this before any loading/binding is scheduled below.
            mDeferredBindRunnables.clear();

            // Don't bother to start the thread if we know it's not going to do anything
            if (mCallbacks != null && mCallbacks.get() != null) {
                // If there is already one running, tell it to stop. also, don't downgrade isLaunching if we're already running
                isLaunching = isLaunching || stopLoaderLocked();
                mLoaderTask = new LoaderTask(mApp, isLaunching);
                if (synchronousBindPage > -1 && mAllAppsLoaded && mWorkspaceLoaded) {
                    mLoaderTask.runBindSynchronousPage(synchronousBindPage);
                } else {
                    sWorkerThread.setPriority(Thread.NORM_PRIORITY);
                    sWorker.post(mLoaderTask);
                }
            }
        }
    }

    void bindRemainingSynchronousPages() {
        // Post the remaining side pages to be loaded
        if (!mDeferredBindRunnables.isEmpty()) {
            for (final Runnable r : mDeferredBindRunnables) {
                mHandler.post(r, MAIN_THREAD_BINDING_RUNNABLE);
            }
            mDeferredBindRunnables.clear();
        }
    }

    public void stopLoader() {
        synchronized (mLock) {
            if (mLoaderTask != null) {
                mLoaderTask.stopLocked();
            }
        }
    }

    public boolean isAllAppsLoaded() {
        return mAllAppsLoaded;
    }

    boolean isLoadingWorkspace() {
        synchronized (mLock) {
            if (mLoaderTask != null) {
                return mLoaderTask.isLoadingWorkspace();
            }
        }
        return false;
    }

    /**
     * Runnable for the thread that loads the contents of the launcher:
     *   - workspace icons
     *   - widgets
     *   - all apps icons
     */
    private class LoaderTask implements Runnable {
        private Context mContext;
        private boolean mIsLaunching;
        private boolean mIsLoadingAndBindingWorkspace;
        private boolean mStopped;
        private boolean mLoadAndBindStepFinished;

        private HashMap<Object, CharSequence> mLabelCache;

        @SuppressLint("UseSparseArrays")
		LoaderTask(Context context, boolean isLaunching) {
            mContext = context;
            mIsLaunching = isLaunching;
            mLabelCache = new HashMap<Object, CharSequence>();
        }

        boolean isLaunching() {
            return mIsLaunching;
        }

        boolean isLoadingWorkspace() {
            return mIsLoadingAndBindingWorkspace;
        }

        private void loadAndBindWorkspace() {
            mIsLoadingAndBindingWorkspace = true;
            // Load the workspace
            if (!mWorkspaceLoaded) {
                loadWorkspace();
                synchronized (LoaderTask.this) {
                    if (mStopped) {
                        return;
                    }
                    mWorkspaceLoaded = true;
                }
            }
            // Bind the workspace
            bindWorkspace(-1);
        }

        private void waitForIdle() {
            // Wait until the either we're stopped or the other threads are done. This way we don't start loading all apps until the workspace has settled down.
            synchronized (LoaderTask.this) {
                final long workspaceWaitTime = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
                mHandler.postIdle(new Runnable() {
                        public void run() {
                            synchronized (LoaderTask.this) {
                                mLoadAndBindStepFinished = true;
                                if (DEBUG_LOADERS) {
                                    Log.d(TAG, "done with previous binding step");
                                }
                                LoaderTask.this.notify();
                            }
                        }
                    });

                while (!mStopped && !mLoadAndBindStepFinished) {
                    try {
                        this.wait();
                    } catch (InterruptedException ex) {
                    }
                }
                if (DEBUG_LOADERS) {
                    Log.d(TAG, "waited " + (SystemClock.uptimeMillis()-workspaceWaitTime) + "ms for previous step to finish binding");
                }
            }
        }

        void runBindSynchronousPage(int synchronousBindPage) {
            if (synchronousBindPage < 0) {
                // Ensure that we have a valid page index to load synchronously
                throw new RuntimeException("Should not call runBindSynchronousPage() without " + "valid page index");
            }
            if (!mAllAppsLoaded || !mWorkspaceLoaded) {
                // Ensure that we don't try and bind a specified page when the pages have not been loaded already (we should load everything asynchronously in that case)
                throw new RuntimeException("Expecting AllApps and Workspace to be loaded");
            }
            synchronized (mLock) {
                if (mIsLoaderTaskRunning) {
                    // Ensure that we are never running the background loading at this point since we also touch the background collections
                    throw new RuntimeException("Error! Background loading is already running");
                }
            }

            // XXX: Throw an exception if we are already loading (since we touch the worker thread data structures, we can't allow any other thread to touch that data, but because this call is synchronous, we can get away with not locking).
            // The LauncherModel is static in the LauncherApplication and mHandler may have queued operations from the previous activity.  We need to ensure that all queued operations are executed before any synchronous binding work is done.
            mHandler.flush();
            // Divide the set of loaded items into those that we are binding synchronously, and everything else that is to be bound normally (asynchronously).
            bindWorkspace(synchronousBindPage);
            // XXX: For now, continue posting the binding of AllApps as there are other issues that arise from that.
            onlyBindAllApps();
        }

        public void run() {
            synchronized (mLock) {
                mIsLoaderTaskRunning = true;
            }
            // Optimize for end-user experience: if the Launcher is up and // running with the All Apps interface in the foreground, load All Apps first. Otherwise, load the workspace first (default).
            final Callbacks cbk = mCallbacks.get();
            final boolean loadWorkspaceFirst = cbk != null ? (!cbk.isAllAppsVisible()) : true;

            keep_running: {
                // Elevate priority when Home launches for the first time to avoid starving at boot time. Staring at a blank home is not cool.
                synchronized (mLock) {
                    if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to " + (mIsLaunching ? "DEFAULT" : "BACKGROUND"));
                    android.os.Process.setThreadPriority(mIsLaunching ? Process.THREAD_PRIORITY_DEFAULT : Process.THREAD_PRIORITY_BACKGROUND);
                }
                if (loadWorkspaceFirst) {
                    if (DEBUG_LOADERS) Log.d(TAG, "step ---a-aaaaaa--------->: loading workspace");
                    loadAndBindWorkspace();
                } else {
                    if (DEBUG_LOADERS) Log.d(TAG, "step 1: special: loading all apps");
                    loadAndBindAllApps();
                }

                if (mStopped) {
                    break keep_running;
                }

                // Whew! Hard work done.  Slow us down, and wait until the UI thread has settled down.
                synchronized (mLock) {
                    if (mIsLaunching) {
                        if (DEBUG_LOADERS) Log.d(TAG, "Setting thread priority to BACKGROUND");
                        android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_BACKGROUND);
                    }
                }
                waitForIdle();

                // second step
                if (loadWorkspaceFirst) {
                    if (DEBUG_LOADERS) Log.d(TAG, "step 2: loading all apps");
                    loadAndBindAllApps();
                } else {
                    if (DEBUG_LOADERS) Log.d(TAG, "step 2: special: loading workspace");
                    loadAndBindWorkspace();
                }

                // Restore the default thread priority after we are done loading items
                synchronized (mLock) {
                    android.os.Process.setThreadPriority(Process.THREAD_PRIORITY_DEFAULT);
                }
            }


            // Update the saved icons if necessary
            if (DEBUG_LOADERS) Log.d(TAG, "Comparing loaded icons to database icons");
            synchronized (sBgLock) {
                for (Object key : sBgDbIconCache.keySet()) {
                    updateSavedIcon(mContext, (ShortcutInfo) key, sBgDbIconCache.get(key));
                }
                sBgDbIconCache.clear();
            }

            // Clear out this reference, otherwise we end up holding it until all of the callback runnables are done.
            mContext = null;

            synchronized (mLock) {
                // If we are still the last one to be scheduled, remove ourselves.
                if (mLoaderTask == this) {
                    mLoaderTask = null;
                }
                mIsLoaderTaskRunning = false;
            }
        }

        public void stopLocked() {
            synchronized (LoaderTask.this) {
                mStopped = true;
                this.notify();
            }
        }

        /** Gets the callbacks object.  If we've been stopped, or if the launcher object has somehow been garbage collected, return null instead.  Pass in the Callbacks object that was around when the deferred message was scheduled, and if there's a new Callbacks object around then also return null.  This will save us from calling onto it with data that will be ignored. */
        Callbacks tryGetCallbacks(Callbacks oldCallbacks) {
            synchronized (mLock) {
                if (mStopped) {
                    return null;
                }

                if (mCallbacks == null) {
                    return null;
                }

                final Callbacks callbacks = mCallbacks.get();
                if (callbacks != oldCallbacks) {
                    return null;
                }
                if (callbacks == null) {
                    Log.w(TAG, "no mCallbacks");
                    return null;
                }

                return callbacks;
            }
        }

        // check & update map of what's occupied; used to discard overlapping/invalid items
        private boolean checkItemPlacement(ItemInfo occupied[][][], ItemInfo item) {
            int containerIndex = item.screen;
            if (item.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                // Return early if we detect that an item is under the hotseat button
                if (mCallbacks == null || mCallbacks.get().isAllAppsButtonRank(item.screen)) {
                    return false;
                }

                // We use the last index to refer to the hotseat and the screen as the rank, so test and update the occupied state accordingly
                if (occupied[Launcher.SCREEN_COUNT][item.screen][0] != null) {
                    Log.e(TAG, "Error loading shortcut into hotseat " + item + " into position (" + item.screen + ":" + item.cellX + "," + item.cellY + ") occupied by " + occupied[Launcher.SCREEN_COUNT][item.screen][0]);
                    return false;
                } else {
                    occupied[Launcher.SCREEN_COUNT][item.screen][0] = item;
                    return true;
                }
            } else if (item.container != LauncherSettings.Favorites.CONTAINER_DESKTOP) {
                // Skip further checking if it is not the hotseat or workspace container
                return true;
            }

            // Check if any workspace icons overlap with each other
            for (int x = item.cellX; x < (item.cellX+item.spanX); x++) {
                for (int y = item.cellY; y < (item.cellY+item.spanY); y++) {
                    if (occupied[containerIndex][x][y] != null) {
                        Log.e(TAG, "Error loading shortcut " + item + " into cell (" + containerIndex + "-" + item.screen + ":" + x + "," + y + ") occupied by " + occupied[containerIndex][x][y]);
                        return false;
                    }
                }
            }
            for (int x = item.cellX; x < (item.cellX+item.spanX); x++) {
                for (int y = item.cellY; y < (item.cellY+item.spanY); y++) {
                    occupied[containerIndex][x][y] = item;
                }
            }
            return true;
        }

        private void loadWorkspace() {
//            final long t = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
            final Context context = mContext;
            final ContentResolver contentResolver = context.getContentResolver();
            final PackageManager manager = context.getPackageManager();
            final AppWidgetManager widgets = AppWidgetManager.getInstance(context);
            final boolean isSafeMode = manager.isSafeMode();
            // Make sure the default workspace is loaded, if needed
            mApp.getLauncherProvider().loadDefaultFavoritesIfNecessary(0);

            synchronized (sBgLock) {
                sBgWorkspaceItems.clear();
                sBgAppWidgets.clear();
                sBgFolders.clear();
                sBgItemsIdMap.clear();
                sBgDbIconCache.clear();
                final ArrayList<Long> itemsToRemove = new ArrayList<Long>();
                final Cursor c = contentResolver.query(LauncherSettings.Favorites.CONTENT_URI, null, null, null, null);
                // +1 for the hotseat (it can be larger than the workspace) Load workspace in reverse order to ensure that latest items are loaded first (and before any earlier duplicates)
                final ItemInfo occupied[][][] = new ItemInfo[Launcher.SCREEN_COUNT + 1][mCellCountX + 1][mCellCountY + 1];

                try {
                    final int idIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites._ID);
                    final int intentIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.INTENT);
                    final int titleIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.TITLE);
                    final int iconTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_TYPE);
                    final int iconIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON);
                    final int iconPackageIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_PACKAGE);
                    final int iconResourceIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ICON_RESOURCE);
                    final int containerIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CONTAINER);
                    final int itemTypeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.ITEM_TYPE);
                    final int appWidgetIdIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.APPWIDGET_ID);
                    final int screenIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SCREEN);
                    final int cellXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLX);
                    final int cellYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.CELLY);
                    final int spanXIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANX);
                    final int spanYIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.SPANY);
                    //final int uriIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.URI);
                    //final int displayModeIndex = c.getColumnIndexOrThrow(LauncherSettings.Favorites.DISPLAY_MODE);

                    ShortcutInfo info;
                    String intentDescription;
                    LauncherAppWidgetInfo appWidgetInfo;
                    int container;
                    long id;
                    Intent intent;

                    while (!mStopped && c.moveToNext()) {
                        try {
                            int itemType = c.getInt(itemTypeIndex);

                            switch (itemType) {
                            case LauncherSettings.Favorites.ITEM_TYPE_APPLICATION:
                            case LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT:
                                intentDescription = c.getString(intentIndex);
                                try {
                                    intent = Intent.parseUri(intentDescription, 0);
                                } catch (URISyntaxException e) {
                                    continue;
                                }

                                if (itemType == LauncherSettings.Favorites.ITEM_TYPE_APPLICATION) {
                                    info = getShortcutInfo(manager, intent, context, c, iconIndex, titleIndex, mLabelCache);
                                } else {
                                    info = getShortcutInfo(c, context, iconTypeIndex, iconPackageIndex, iconResourceIndex, iconIndex, titleIndex);
                                    // App shortcuts that used to be automatically added to Launcher didn't always have the correct intent flags set, so do that here
                                    if (intent.getAction() != null && intent.getCategories() != null && intent.getAction().equals(Intent.ACTION_MAIN) && intent.getCategories().contains(Intent.CATEGORY_LAUNCHER)) {
                                        intent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_RESET_TASK_IF_NEEDED);
                                    }
                                }

                                if (info != null) {
                                    info.intent = intent;
                                    info.id = c.getLong(idIndex);
                                    container = c.getInt(containerIndex);
                                    info.container = container;
                                    info.screen = c.getInt(screenIndex);
                                    info.cellX = c.getInt(cellXIndex);
                                    info.cellY = c.getInt(cellYIndex);

                                    // check & update map of what's occupied
                                    if (!checkItemPlacement(occupied, info)) {
                                        break;
                                    }

                                    switch (container) {
                                    case LauncherSettings.Favorites.CONTAINER_DESKTOP:
                                    case LauncherSettings.Favorites.CONTAINER_HOTSEAT:
                                        sBgWorkspaceItems.add(info);
                                        break;
                                    default:
                                        // Item is in a user folder
                                        FolderInfo folderInfo = findOrMakeFolder(sBgFolders, container);
                                        folderInfo.add(info);
                                        break;
                                    }
                                    sBgItemsIdMap.put(info.id, info);

                                    // now that we've loaded everthing re-save it with the icon in case it disappears somehow.
                                    queueIconToBeChecked(sBgDbIconCache, info, c, iconIndex);
                                } else {
                                    // Failed to load the shortcut, probably because the activity manager couldn't resolve it (maybe the app was uninstalled), or the db row was somehow screwed up. Delete it.
                                    id = c.getLong(idIndex);
                                    Log.e(TAG, "Error loading shortcut " + id + ", removing it");
                                    contentResolver.delete(LauncherSettings.Favorites.getContentUri(id, false), null, null);
                                }
                                break;

                            case LauncherSettings.Favorites.ITEM_TYPE_FOLDER:
                                id = c.getLong(idIndex);
                                FolderInfo folderInfo = findOrMakeFolder(sBgFolders, id);

                                folderInfo.title = c.getString(titleIndex);
                                folderInfo.id = id;
                                container = c.getInt(containerIndex);
                                folderInfo.container = container;
                                folderInfo.screen = c.getInt(screenIndex);
                                folderInfo.cellX = c.getInt(cellXIndex);
                                folderInfo.cellY = c.getInt(cellYIndex);

                                // check & update map of what's occupied
                                if (!checkItemPlacement(occupied, folderInfo)) {
                                    break;
                                }
                                switch (container) {
                                    case LauncherSettings.Favorites.CONTAINER_DESKTOP:
                                    case LauncherSettings.Favorites.CONTAINER_HOTSEAT:
                                        sBgWorkspaceItems.add(folderInfo);
                                        break;
                                }

                                sBgItemsIdMap.put(folderInfo.id, folderInfo);
                                sBgFolders.put(folderInfo.id, folderInfo);
                                break;

                            case LauncherSettings.Favorites.ITEM_TYPE_APPWIDGET:
                                // Read all Launcher-specific widget details
                                int appWidgetId = c.getInt(appWidgetIdIndex);
                                id = c.getLong(idIndex);

                                final AppWidgetProviderInfo provider = widgets.getAppWidgetInfo(appWidgetId);

                                if (!isSafeMode && (provider == null || provider.provider == null || provider.provider.getPackageName() == null)) {
                                    String log = "Deleting widget that isn't installed anymore: id=" + id + " appWidgetId=" + appWidgetId;
                                    Log.e(TAG, log);
                                    Launcher.sDumpLogs.add(log);
                                    itemsToRemove.add(id);
                                } else {
                                    appWidgetInfo = new LauncherAppWidgetInfo(appWidgetId, provider.provider);
                                    appWidgetInfo.id = id;
                                    appWidgetInfo.screen = c.getInt(screenIndex);
                                    appWidgetInfo.cellX = c.getInt(cellXIndex);
                                    appWidgetInfo.cellY = c.getInt(cellYIndex);
                                    appWidgetInfo.spanX = c.getInt(spanXIndex);
                                    appWidgetInfo.spanY = c.getInt(spanYIndex);
                                    int[] minSpan = Launcher.getMinSpanForWidget(context, provider);
                                    appWidgetInfo.minSpanX = minSpan[0];
                                    appWidgetInfo.minSpanY = minSpan[1];

                                    container = c.getInt(containerIndex);
                                    if (container != LauncherSettings.Favorites.CONTAINER_DESKTOP &&
                                        container != LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                                        Log.e(TAG, "Widget found where container != " + "CONTAINER_DESKTOP nor CONTAINER_HOTSEAT - ignoring!");
                                        continue;
                                    }
                                    appWidgetInfo.container = c.getInt(containerIndex);

                                    // check & update map of what's occupied
                                    if (!checkItemPlacement(occupied, appWidgetInfo)) {
                                        break;
                                    }
                                    sBgItemsIdMap.put(appWidgetInfo.id, appWidgetInfo);
                                    sBgAppWidgets.add(appWidgetInfo);
                                }
                                break;
                            }
                        } catch (Exception e) {
                            Log.w(TAG, "Desktop items loading interrupted:", e);
                        }
                    }
                } finally {
                    c.close();
                }

                if (itemsToRemove.size() > 0) {
                    ContentProviderClient client = contentResolver.acquireContentProviderClient(LauncherSettings.Favorites.CONTENT_URI);
                    // Remove dead items
                    for (long id : itemsToRemove) {
                        if (DEBUG_LOADERS) {
                            Log.d(TAG, "Removed id = " + id);
                        }
                        // Don't notify content observers
                        try {
                            client.delete(LauncherSettings.Favorites.getContentUri(id, false), null, null);
                        } catch (RemoteException e) {
                            Log.w(TAG, "Could not remove id = " + id);
                        }
                    }
                }

                if (DEBUG_LOADERS) {
//                    Log.d(TAG, "loaded workspace in " + (SystemClock.uptimeMillis()-t) + "ms");
//                    Log.d(TAG, "workspace layout: ");
                    for (int y = 0; y < mCellCountY; y++) {
                        String line = "";
                        for (int s = 0; s < Launcher.SCREEN_COUNT; s++) {
                            if (s > 0) {
                                line += " | ";
                            }
                            for (int x = 0; x < mCellCountX; x++) {
                                line += ((occupied[s][x][y] != null) ? "#" : ".");
                            }
                        }
                        Log.d(TAG, "[ " + line + " ]");
                    }
                }
            }
        }

        /** Filters the set of items who are directly or indirectly (via another container) on the specified screen. */
        private void filterCurrentWorkspaceItems(int currentScreen, ArrayList<ItemInfo> allWorkspaceItems, ArrayList<ItemInfo> currentScreenItems, ArrayList<ItemInfo> otherScreenItems) {
            // Purge any null ItemInfos
            Iterator<ItemInfo> iter = allWorkspaceItems.iterator();
            while (iter.hasNext()) {
                ItemInfo i = iter.next();
                if (i == null) {
                    iter.remove();
                }
            }

            // If we aren't filtering on a screen, then the set of items to load is the full set of items given.
            if (currentScreen < 0) {
                currentScreenItems.addAll(allWorkspaceItems);
            }

            // Order the set of items by their containers first, this allows use to walk through the list sequentially, build up a list of containers that are in the specified screen, as well as all items in those containers.
            Set<Long> itemsOnScreen = new HashSet<Long>();
            Collections.sort(allWorkspaceItems, new Comparator<ItemInfo>() {
                @Override
                public int compare(ItemInfo lhs, ItemInfo rhs) {
                    return (int) (lhs.container - rhs.container);
                }
            });
            for (ItemInfo info : allWorkspaceItems) {
                if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP) {
                    if (info.screen == currentScreen) {
                        currentScreenItems.add(info);
                        itemsOnScreen.add(info.id);
                    } else {
                        otherScreenItems.add(info);
                    }
                } else if (info.container == LauncherSettings.Favorites.CONTAINER_HOTSEAT) {
                    currentScreenItems.add(info);
                    itemsOnScreen.add(info.id);
                } else {
                    if (itemsOnScreen.contains(info.container)) {
                        currentScreenItems.add(info);
                        itemsOnScreen.add(info.id);
                    } else {
                        otherScreenItems.add(info);
                    }
                }
            }
        }

        /** Filters the set of widgets which are on the specified screen. */
        private void filterCurrentAppWidgets(int currentScreen, ArrayList<LauncherAppWidgetInfo> appWidgets, ArrayList<LauncherAppWidgetInfo> currentScreenWidgets, ArrayList<LauncherAppWidgetInfo> otherScreenWidgets) {
            // If we aren't filtering on a screen, then the set of items to load is the full set of widgets given.
            if (currentScreen < 0) {
                currentScreenWidgets.addAll(appWidgets);
            }

            for (LauncherAppWidgetInfo widget : appWidgets) {
                if (widget == null) continue;
                if (widget.container == LauncherSettings.Favorites.CONTAINER_DESKTOP && widget.screen == currentScreen) {
                    currentScreenWidgets.add(widget);
                } else {
                    otherScreenWidgets.add(widget);
                }
            }
        }

        /** Filters the set of folders which are on the specified screen. */
        private void filterCurrentFolders(int currentScreen, HashMap<Long, ItemInfo> itemsIdMap, HashMap<Long, FolderInfo> folders, HashMap<Long, FolderInfo> currentScreenFolders, HashMap<Long, FolderInfo> otherScreenFolders) {
            // If we aren't filtering on a screen, then the set of items to load is the full set of widgets given.
            if (currentScreen < 0) {
                currentScreenFolders.putAll(folders);
            }

            for (long id : folders.keySet()) {
                ItemInfo info = itemsIdMap.get(id);
                FolderInfo folder = folders.get(id);
                if (info == null || folder == null) continue;
                if (info.container == LauncherSettings.Favorites.CONTAINER_DESKTOP && info.screen == currentScreen) {
                    currentScreenFolders.put(id, folder);
                } else {
                    otherScreenFolders.put(id, folder);
                }
            }
        }

        /** Sorts the set of items by hotseat, workspace (spatially from top to bottom, left to right) */
        private void sortWorkspaceItemsSpatially(ArrayList<ItemInfo> workspaceItems) {
            // XXX: review this
            Collections.sort(workspaceItems, new Comparator<ItemInfo>() {
                @Override
                public int compare(ItemInfo lhs, ItemInfo rhs) {
                    int cellCountX = LauncherModel.getCellCountX();
                    int cellCountY = LauncherModel.getCellCountY();
                    int screenOffset = cellCountX * cellCountY;
                    int containerOffset = screenOffset * (Launcher.SCREEN_COUNT + 1); // +1 hotseat
                    long lr = (lhs.container * containerOffset + lhs.screen * screenOffset + lhs.cellY * cellCountX + lhs.cellX);
                    long rr = (rhs.container * containerOffset + rhs.screen * screenOffset + rhs.cellY * cellCountX + rhs.cellX);
                    return (int) (lr - rr);
                }
            });
        }

        private void bindWorkspaceItems(final Callbacks oldCallbacks, final ArrayList<ItemInfo> workspaceItems, final ArrayList<LauncherAppWidgetInfo> appWidgets, final HashMap<Long, FolderInfo> folders, ArrayList<Runnable> deferredBindRunnables) {
            final boolean postOnMainThread = (deferredBindRunnables != null);
            // Bind the workspace items
            int N = workspaceItems.size();
            for (int i = 0; i < N; i += ITEMS_CHUNK) {
                final int start = i;
                final int chunkSize = (i+ITEMS_CHUNK <= N) ? ITEMS_CHUNK : (N-i);
                final Runnable r = new Runnable() {
                    @Override
                    public void run() {
                        Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                        if (callbacks != null) {
                            callbacks.bindItems(workspaceItems, start, start+chunkSize);
                        }
                    }
                };
                if (postOnMainThread) {
                    deferredBindRunnables.add(r);
                } else {
                    runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
                }
            }

            // Bind the folders
            if (!folders.isEmpty()) {
                final Runnable r = new Runnable() {
                    public void run() {
                        Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                        if (callbacks != null) {
                            callbacks.bindFolders(folders);
                        }
                    }
                };
                if (postOnMainThread) {
                    deferredBindRunnables.add(r);
                } else {
                    runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
                }
            }

            // Bind the widgets, one at a time
            N = appWidgets.size();
            for (int i = 0; i < N; i++) {
                final LauncherAppWidgetInfo widget = appWidgets.get(i);
                final Runnable r = new Runnable() {
                    public void run() {
                        Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                        if (callbacks != null) {
                            callbacks.bindAppWidget(widget);
                        }
                    }
                };
                if (postOnMainThread) {
                    deferredBindRunnables.add(r);
                } else {
                    runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
                }
            }
        }

        /*** Binds all loaded data to actual views on the main thread. */
        private void bindWorkspace(int synchronizeBindPage) {
            final long t = SystemClock.uptimeMillis();
            Runnable r;
            // Don't use these two variables in any of the callback runnables. Otherwise we hold a reference to them.
            final Callbacks oldCallbacks = mCallbacks.get();
            if (oldCallbacks == null) {
                // This launcher has exited and nobody bothered to tell us.  Just bail.
                Log.w(TAG, "LoaderTask running with no launcher");
                return;
            }

            final boolean isLoadingSynchronously = (synchronizeBindPage > -1);
            final int currentScreen = isLoadingSynchronously ? synchronizeBindPage : oldCallbacks.getCurrentWorkspaceScreen();
            // Load all the items that are on the current page first (and in the process, unbind all the existing workspace items before we call startBinding() below.
            unbindWorkspaceItemsOnMainThread();
            ArrayList<ItemInfo> workspaceItems = new ArrayList<ItemInfo>();
            ArrayList<LauncherAppWidgetInfo> appWidgets = new ArrayList<LauncherAppWidgetInfo>();
            HashMap<Long, FolderInfo> folders = new HashMap<Long, FolderInfo>();
            HashMap<Long, ItemInfo> itemsIdMap = new HashMap<Long, ItemInfo>();
            synchronized (sBgLock) {
                workspaceItems.addAll(sBgWorkspaceItems);
                appWidgets.addAll(sBgAppWidgets);
                folders.putAll(sBgFolders);
                itemsIdMap.putAll(sBgItemsIdMap);
            }

            ArrayList<ItemInfo> currentWorkspaceItems = new ArrayList<ItemInfo>();
            ArrayList<ItemInfo> otherWorkspaceItems = new ArrayList<ItemInfo>();
            ArrayList<LauncherAppWidgetInfo> currentAppWidgets = new ArrayList<LauncherAppWidgetInfo>();
            ArrayList<LauncherAppWidgetInfo> otherAppWidgets = new ArrayList<LauncherAppWidgetInfo>();
            HashMap<Long, FolderInfo> currentFolders = new HashMap<Long, FolderInfo>();
            HashMap<Long, FolderInfo> otherFolders = new HashMap<Long, FolderInfo>();

            // Separate the items that are on the current screen, and all the other remaining items
            filterCurrentWorkspaceItems(currentScreen, workspaceItems, currentWorkspaceItems, otherWorkspaceItems);
            filterCurrentAppWidgets(currentScreen, appWidgets, currentAppWidgets, otherAppWidgets);
            filterCurrentFolders(currentScreen, itemsIdMap, folders, currentFolders, otherFolders);
            sortWorkspaceItemsSpatially(currentWorkspaceItems);
            sortWorkspaceItemsSpatially(otherWorkspaceItems);

            // Tell the workspace that we're about to start binding items
            r = new Runnable() {
                public void run() {
                    Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                    if (callbacks != null) {
                        callbacks.startBinding();
                    }
                }
            };
            runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);

            // Load items on the current page
            bindWorkspaceItems(oldCallbacks, currentWorkspaceItems, currentAppWidgets, currentFolders, null);
            if (isLoadingSynchronously) {
                r = new Runnable() {
                    public void run() {
                        Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                        if (callbacks != null) {
                            callbacks.onPageBoundSynchronously(currentScreen);
                        }
                    }
                };
                runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
            }

            // Load all the remaining pages (if we are loading synchronously, we want to defer this work until after the first render)
            mDeferredBindRunnables.clear();
            bindWorkspaceItems(oldCallbacks, otherWorkspaceItems, otherAppWidgets, otherFolders, (isLoadingSynchronously ? mDeferredBindRunnables : null));

            // Tell the workspace that we're done binding items
            r = new Runnable() {
                public void run() {
                    Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                    if (callbacks != null) {
                        callbacks.finishBindingItems();
                    }

                    // If we're profiling, ensure this is the last thing in the queue.
                    if (DEBUG_LOADERS) {
                        Log.d(TAG, "bound workspace in " + (SystemClock.uptimeMillis()-t) + "ms");
                    }
                    mIsLoadingAndBindingWorkspace = false;
                }
            };
            if (isLoadingSynchronously) {
                mDeferredBindRunnables.add(r);
            } else {
                runOnMainThread(r, MAIN_THREAD_BINDING_RUNNABLE);
            }
        }

        private void loadAndBindAllApps() {
            if (DEBUG_LOADERS) {
                Log.d(TAG, "loadAndBindAllApps mAllAppsLoaded=" + mAllAppsLoaded);
            }
            if (!mAllAppsLoaded) {
                loadAllAppsByBatch();
                synchronized (LoaderTask.this) {
                    if (mStopped) {
                        return;
                    }
                    mAllAppsLoaded = true;
                }
            } else {
                onlyBindAllApps();
            }
        }

        private void onlyBindAllApps() {
            final Callbacks oldCallbacks = mCallbacks.get();
            if (oldCallbacks == null) {
                // This launcher has exited and nobody bothered to tell us.  Just bail.
                Log.w(TAG, "LoaderTask running with no launcher (onlyBindAllApps)");
                return;
            }

            // shallow copy
            @SuppressWarnings("unchecked")
            final ArrayList<ApplicationInfo> list = (ArrayList<ApplicationInfo>) mBgAllAppsList.data.clone();
            Runnable r = new Runnable() {
                public void run() {
                    final long t = SystemClock.uptimeMillis();
                    final Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                    if (callbacks != null) {
                        callbacks.bindAllApplications(list);
                    }
                    if (DEBUG_LOADERS) {
                        Log.d(TAG, "bound all " + list.size() + " apps from cache in " + (SystemClock.uptimeMillis()-t) + "ms");
                    }
                }
            };
            boolean isRunningOnMainThread = !(sWorkerThread.getThreadId() == Process.myTid());
            if (oldCallbacks.isAllAppsVisible() && isRunningOnMainThread) {
                r.run();
            } else {
                mHandler.post(r);
            }
        }

        private void loadAllAppsByBatch() {
//            final long t = DEBUG_LOADERS ? SystemClock.uptimeMillis() : 0;
            // Don't use these two variables in any of the callback runnables. Otherwise we hold a reference to them.
            final Callbacks oldCallbacks = mCallbacks.get();
            if (oldCallbacks == null) {
                // This launcher has exited and nobody bothered to tell us.  Just bail.
                return;
            }

            final Intent mainIntent = new Intent(Intent.ACTION_MAIN, null);
            mainIntent.addCategory(Intent.CATEGORY_LAUNCHER);

            final PackageManager packageManager = mContext.getPackageManager();
            List<ResolveInfo> apps = null;

            int N = Integer.MAX_VALUE;

            int i=0;
            int batchSize = -1;
            while (i < N && !mStopped) {
                if (i == 0) {
                    mBgAllAppsList.clear();
                    
                    apps = packageManager.queryIntentActivities(mainIntent, 0);
                    if (apps == null) {
                        return;
                    }
                    N = apps.size();
                    if (N == 0) {
                        // There are no apps?!?
                        return;
                    }
                    if (mBatchSize == 0) {
                        batchSize = N;
                    } else {
                        batchSize = mBatchSize;
                    }
//                    Collections.sort(apps, new LauncherModel.ShortcutNameComparator(packageManager, mLabelCache));  // del by zgy
                }

                // This builds the icon bitmaps. Modify by zgy
                for (int j = 0; i < N && j < batchSize; j++) {
//                	String packageName = apps.get(i).activityInfo.packageName;
//                	mBgAllAppsList.addPackage(mApp, packageName);
                	  mBgAllAppsList.add(new ApplicationInfo(packageManager, apps.get(i), mIconCache, mLabelCache));
                    i++;
                }

                final boolean first = i <= batchSize;
                final Callbacks callbacks = tryGetCallbacks(oldCallbacks);
                final ArrayList<ApplicationInfo> added = mBgAllAppsList.added;
                mBgAllAppsList.added = new ArrayList<ApplicationInfo>();

                mHandler.post(new Runnable() {
                    public void run() {
                        if (callbacks != null) {
                            if (first) {
                                callbacks.bindAllApplications(added);
                            } else {
                                callbacks.bindAppsAdded(added);
                            }
                        }
                    }
                });

                if (mAllAppsLoadDelay > 0 && i < N) {
                    try {
                        Thread.sleep(mAllAppsLoadDelay);
                    } catch (InterruptedException exc) { }
                }
            }
        }

        public void dumpState() {
            synchronized (sBgLock) {
                Log.d(TAG, "mLoaderTask.mContext=" + mContext);
                Log.d(TAG, "mLoaderTask.mIsLaunching=" + mIsLaunching);
                Log.d(TAG, "mLoaderTask.mStopped=" + mStopped);
                Log.d(TAG, "mLoaderTask.mLoadAndBindStepFinished=" + mLoadAndBindStepFinished);
                Log.d(TAG, "mItems size=" + sBgWorkspaceItems.size());
            }
        }
    }
    
    void enqueuePackageUpdated(PackageUpdatedTask task) {
        sWorker.post(task);
    }

    private class PackageUpdatedTask implements Runnable {
        int mOp;
        String[] mPackages;

        public static final int OP_NONE = 0;
        public static final int OP_ADD = 1;
        public static final int OP_UPDATE = 2;
        public static final int OP_REMOVE = 3; // uninstlled
        public static final int OP_UNAVAILABLE = 4; // external media unmounted


        public PackageUpdatedTask(int op, String[] packages) {
            mOp = op;
            mPackages = packages;
        }

        public void run() {
            final Context context = mApp;

            final String[] packages = mPackages;
            final int N = packages.length;
            switch (mOp) {
                case OP_ADD:
                    for (int i=0; i<N; i++) {
                        if (DEBUG_LOADERS) Log.d(TAG, "mAllAppsList.addPackage " + packages[i]);
                        mBgAllAppsList.addPackage(context, packages[i]);
                    }
                    break;
                case OP_UPDATE:
                    for (int i=0; i<N; i++) {
                        if (DEBUG_LOADERS) Log.d(TAG, "mAllAppsList.updatePackage " + packages[i]);
                        mBgAllAppsList.updatePackage(context, packages[i]);
                    }
                    break;
                case OP_REMOVE:
                case OP_UNAVAILABLE:
                    for (int i=0; i<N; i++) {
                        if (DEBUG_LOADERS) Log.d(TAG, "mAllAppsList.removePackage " + packages[i]);
                        mBgAllAppsList.removePackage(packages[i]);
                    }
                    break;
            }

            ArrayList<ApplicationInfo> added = null;
            ArrayList<ApplicationInfo> modified = null;

            if (mBgAllAppsList.added.size() > 0) {
                added = new ArrayList<ApplicationInfo>(mBgAllAppsList.added);
                mBgAllAppsList.added.clear();
            }
            if (mBgAllAppsList.modified.size() > 0) {
                modified = new ArrayList<ApplicationInfo>(mBgAllAppsList.modified);
                mBgAllAppsList.modified.clear();
            }
            // We may be removing packages that have no associated launcher application, so we pass through the removed package names directly. We flush the icon cache aggressively in removePackage() above.
            final ArrayList<String> removedPackageNames = new ArrayList<String>();
            if (mBgAllAppsList.removed.size() > 0) {
                mBgAllAppsList.removed.clear();

                for (int i = 0; i < N; ++i) {
                    removedPackageNames.add(packages[i]);
                }
            }

            final Callbacks callbacks = mCallbacks != null ? mCallbacks.get() : null;
            if (callbacks == null) {
                Log.w(TAG, "Nobody to tell about the new app.  Launcher is probably loading.");
                return;
            }

            if (added != null) {
                final ArrayList<ApplicationInfo> addedFinal = added;
                mHandler.post(new Runnable() {
                    public void run() {
                        Callbacks cb = mCallbacks != null ? mCallbacks.get() : null;
                        if (callbacks == cb && cb != null) {
                            callbacks.bindAppsAdded(addedFinal);
                        }
                    }
                });
            }
            if (modified != null) {
                final ArrayList<ApplicationInfo> modifiedFinal = modified;
                mHandler.post(new Runnable() {
                    public void run() {
                        Callbacks cb = mCallbacks != null ? mCallbacks.get() : null;
                        if (callbacks == cb && cb != null) {
                            callbacks.bindAppsUpdated(modifiedFinal);
                        }
                    }
                });
            }
            if (!removedPackageNames.isEmpty()) {
                final boolean permanent = mOp != OP_UNAVAILABLE;
                mHandler.post(new Runnable() {
                    public void run() {
                        Callbacks cb = mCallbacks != null ? mCallbacks.get() : null;
                        if (callbacks == cb && cb != null) {
                            callbacks.bindAppsRemoved(removedPackageNames, permanent);
                        }
                    }
                });
            }

            mHandler.post(new Runnable() {
                @Override
                public void run() {
                    Callbacks cb = mCallbacks != null ? mCallbacks.get() : null;
                    if (callbacks == cb && cb != null) {
                        callbacks.bindPackagesUpdated();
                    }
                }
            });
        }
    }

    /**
     * This is called from the code that adds shortcuts from the intent receiver.  This doesn't have a Cursor, but
     */
    public ShortcutInfo getShortcutInfo(PackageManager manager, Intent intent, Context context) {
        return getShortcutInfo(manager, intent, context, null, -1, -1, null);
    }

    /**
     * Make an ShortcutInfo object for a shortcut that is an application.
     * If c is not null, then it will be used to fill in missing data like the title and icon.
     */
    public ShortcutInfo getShortcutInfo(PackageManager manager, Intent intent, Context context, Cursor c, int iconIndex, int titleIndex, HashMap<Object, CharSequence> labelCache) {
        Bitmap icon = null;
        final ShortcutInfo info = new ShortcutInfo();

        ComponentName componentName = intent.getComponent();
        if (componentName == null) {
            return null;
        }

        try {
            PackageInfo pi = manager.getPackageInfo(componentName.getPackageName(), 0);
            if (!pi.applicationInfo.enabled) {
                // If we return null here, the corresponding item will be removed from the launcher db and will not appear in the workspace.
                return null;
            }
        } catch (NameNotFoundException e) {
            Log.d(TAG, "getPackInfo failed for package " + componentName.getPackageName());
        }
        // See if the PackageManager knows about this case.  If it doesn't then return null & delete this.
        // the resource -- This may implicitly give us back the fallback icon, but don't worry about that.  All we're doing with usingFallbackIcon is to avoid saving lots of copies of that in the database, and most apps have icons anyway.
        // Attempt to use queryIntentActivities to get the ResolveInfo (with IntentFilter info) and if that fails, or is ambiguious, fallback to the standard way of getting the resolve info via resolveActivity().
        ResolveInfo resolveInfo = null;
        ComponentName oldComponent = intent.getComponent();
        Intent newIntent = new Intent(intent.getAction(), null);
        newIntent.addCategory(Intent.CATEGORY_LAUNCHER);
        newIntent.setPackage(oldComponent.getPackageName());
        List<ResolveInfo> infos = manager.queryIntentActivities(newIntent, 0);
        for (ResolveInfo i : infos) {
            ComponentName cn = new ComponentName(i.activityInfo.packageName, i.activityInfo.name);
            if (cn.equals(oldComponent)) {
                resolveInfo = i;
            }
        }
        if (resolveInfo == null) {
            resolveInfo = manager.resolveActivity(intent, 0);
        }
        if (resolveInfo != null) {
            icon = mIconCache.getIcon(componentName, resolveInfo, labelCache);
        }
        // the db
        if (icon == null) {
            if (c != null) {
                icon = getIconFromCursor(c, iconIndex, context);
            }
        }
        // the fallback icon
        if (icon == null) {
            icon = getFallbackIcon();
            info.usingFallbackIcon = true;
        }
        info.setIcon(icon);

        // from the resource
        if (resolveInfo != null) {
            ComponentName key = LauncherModel.getComponentNameFromResolveInfo(resolveInfo);
            if (labelCache != null && labelCache.containsKey(key)) {
                info.title = labelCache.get(key);
            } else {
                info.title = resolveInfo.activityInfo.loadLabel(manager);
                if (labelCache != null) {
                    labelCache.put(key, info.title);
                }
            }
        }
        // from the db
        if (info.title == null) {
            if (c != null) {
                info.title =  c.getString(titleIndex);
            }
        }
        // fall back to the class name of the activity
        if (info.title == null) {
            info.title = componentName.getClassName();
        }
        info.itemType = LauncherSettings.Favorites.ITEM_TYPE_APPLICATION;
        return info;
    }

    /*** Returns the set of workspace ShortcutInfos with the specified intent.  */
    static ArrayList<ItemInfo> getWorkspaceShortcutItemInfosWithIntent(Intent intent) {
        ArrayList<ItemInfo> items = new ArrayList<ItemInfo>();
        synchronized (sBgLock) {
            for (ItemInfo info : sBgWorkspaceItems) {
                if (info instanceof ShortcutInfo) {
                    ShortcutInfo shortcut = (ShortcutInfo) info;
                    if (shortcut.intent.toUri(0).equals(intent.toUri(0))) {
                        items.add(shortcut);
                    }
                }
            }
        }
        return items;
    }

    /*** Make an ShortcutInfo object for a shortcut that isn't an application.  */
    private ShortcutInfo getShortcutInfo(Cursor c, Context context, int iconTypeIndex, int iconPackageIndex, int iconResourceIndex, int iconIndex, int titleIndex) {
        Bitmap icon = null;
        final ShortcutInfo info = new ShortcutInfo();
        info.itemType = LauncherSettings.Favorites.ITEM_TYPE_SHORTCUT;
        //If there's an explicit component and we can't install that, delete it.
        info.title = c.getString(titleIndex);

        int iconType = c.getInt(iconTypeIndex);
        switch (iconType) {
	        case LauncherSettings.Favorites.ICON_TYPE_RESOURCE:
	            String packageName = c.getString(iconPackageIndex);
	            String resourceName = c.getString(iconResourceIndex);
	            PackageManager packageManager = context.getPackageManager();
	            info.customIcon = false;
	            // the resource
	            try {
	                Resources resources = packageManager.getResourcesForApplication(packageName);
	                if (resources != null) {
	                    final int id = resources.getIdentifier(resourceName, null, null);
	                    icon = Utilities.createIconBitmap(mIconCache.getFullResIcon(resources, id), context);
	                }
	            } catch (Exception e) {
	                // drop this.  we have other places to look for icons
	            }
	            // the db
	            if (icon == null) {
	                icon = getIconFromCursor(c, iconIndex, context);
	            }
	            // the fallback icon
	            if (icon == null) {
	                icon = getFallbackIcon();
	                info.usingFallbackIcon = true;
	            }
            break;
            
        case LauncherSettings.Favorites.ICON_TYPE_BITMAP:
            icon = getIconFromCursor(c, iconIndex, context);
            if (icon == null) {
                icon = getFallbackIcon();
                info.customIcon = false;
                info.usingFallbackIcon = true;
            } else {
                info.customIcon = true;
            }
            break;
        default:
            icon = getFallbackIcon();
            info.usingFallbackIcon = true;
            info.customIcon = false;
            break;
        }
        info.setIcon(icon);
        return info;
    }

    Bitmap getIconFromCursor(Cursor c, int iconIndex, Context context) {
        @SuppressWarnings("all") // suppress dead code warning
        final boolean debug = false;
        if (debug) {
            Log.d(TAG, "getIconFromCursor app=" + c.getString(c.getColumnIndexOrThrow(LauncherSettings.Favorites.TITLE)));
        }
        byte[] data = c.getBlob(iconIndex);
        try {
            return Utilities.createIconBitmap(BitmapFactory.decodeByteArray(data, 0, data.length), context);
        } catch (Exception e) {
            return null;
        }
    }

    ShortcutInfo addShortcut(Context context, Intent data, long container, int screen, int cellX, int cellY, boolean notify) {
        final ShortcutInfo info = infoFromShortcutIntent(context, data, null);
        if (info == null) {
            return null;
        }
        addItemToDatabase(context, info, container, screen, cellX, cellY, notify);
        return info;
    }

    /*** Attempts to find an AppWidgetProviderInfo that matches the given component. */
    AppWidgetProviderInfo findAppWidgetProviderInfoWithComponent(Context context, ComponentName component) {
        List<AppWidgetProviderInfo> widgets = AppWidgetManager.getInstance(context).getInstalledProviders();
        for (AppWidgetProviderInfo info : widgets) {
            if (info.provider.equals(component)) {
                return info;
            }
        }
        return null;
    }

    /*** Returns a list of all the widgets that can handle configuration with a particular mimeType. */
    List<WidgetMimeTypeHandlerData> resolveWidgetsForMimeType(Context context, String mimeType) {
        final PackageManager packageManager = context.getPackageManager();
        final List<WidgetMimeTypeHandlerData> supportedConfigurationActivities = new ArrayList<WidgetMimeTypeHandlerData>();
        final Intent supportsIntent = new Intent(InstallWidgetReceiver.ACTION_SUPPORTS_CLIPDATA_MIMETYPE);
        supportsIntent.setType(mimeType);
        // Create a set of widget configuration components that we can test against
        final List<AppWidgetProviderInfo> widgets = AppWidgetManager.getInstance(context).getInstalledProviders();
        final HashMap<ComponentName, AppWidgetProviderInfo> configurationComponentToWidget = new HashMap<ComponentName, AppWidgetProviderInfo>();
        for (AppWidgetProviderInfo info : widgets) {
            configurationComponentToWidget.put(info.configure, info);
        }

        // Run through each of the intents that can handle this type of clip data, and cross reference them with the components that are actual configuration components
        final List<ResolveInfo> activities = packageManager.queryIntentActivities(supportsIntent, PackageManager.MATCH_DEFAULT_ONLY);
        for (ResolveInfo info : activities) {
            final ActivityInfo activityInfo = info.activityInfo;
            final ComponentName infoComponent = new ComponentName(activityInfo.packageName, activityInfo.name);
            if (configurationComponentToWidget.containsKey(infoComponent)) {
                supportedConfigurationActivities.add(new InstallWidgetReceiver.WidgetMimeTypeHandlerData(info, configurationComponentToWidget.get(infoComponent)));
            }
        }
        return supportedConfigurationActivities;
    }

    ShortcutInfo infoFromShortcutIntent(Context context, Intent data, Bitmap fallbackIcon) {
        Intent intent = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_INTENT);
        String name = data.getStringExtra(Intent.EXTRA_SHORTCUT_NAME);
        Parcelable bitmap = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON);

        if (intent == null) {
            // If the intent is null, we can't construct a valid ShortcutInfo, so we return null
            Log.e(TAG, "Can't construct ShorcutInfo with null intent");
            return null;
        }

        Bitmap icon = null;
        boolean customIcon = false;
        ShortcutIconResource iconResource = null;

        if (bitmap != null && bitmap instanceof Bitmap) {
            icon = Utilities.createIconBitmap(new FastBitmapDrawable((Bitmap)bitmap), context);
            customIcon = true;
        } else {
            Parcelable extra = data.getParcelableExtra(Intent.EXTRA_SHORTCUT_ICON_RESOURCE);
            if (extra != null && extra instanceof ShortcutIconResource) {
                try {
                    iconResource = (ShortcutIconResource) extra;
                    final PackageManager packageManager = context.getPackageManager();
                    Resources resources = packageManager.getResourcesForApplication(iconResource.packageName);
                    final int id = resources.getIdentifier(iconResource.resourceName, null, null);
                    icon = Utilities.createIconBitmap(mIconCache.getFullResIcon(resources, id), context);
                } catch (Exception e) {
                    Log.w(TAG, "Could not load shortcut icon: " + extra);
                }
            }
        }

        final ShortcutInfo info = new ShortcutInfo();
        if (icon == null) {
            if (fallbackIcon != null) {
                icon = fallbackIcon;
            } else {
                icon = getFallbackIcon();
                info.usingFallbackIcon = true;
            }
        }
        info.setIcon(icon);

        info.title = name;
        info.intent = intent;
        info.customIcon = customIcon;
        info.iconResource = iconResource;

        return info;
    }

    boolean queueIconToBeChecked(HashMap<Object, byte[]> cache, ShortcutInfo info, Cursor c, int iconIndex) {
        // If apps can't be on SD, don't even bother.
        if (!mAppsCanBeOnExternalStorage) {
            return false;
        }
        // If this icon doesn't have a custom icon, check to see what's stored in the DB, and if it doesn't match what we're going to show, store what we are going to show back into the DB.  We do this so when we're loading, if the package manager can't find an icon (for example because the app is on SD) then we can use that instead.
        if (!info.customIcon && !info.usingFallbackIcon) {
            cache.put(info, c.getBlob(iconIndex));
            return true;
        }
        return false;
    }
    void updateSavedIcon(Context context, ShortcutInfo info, byte[] data) {
        boolean needSave = false;
        try {
            if (data != null) {
                Bitmap saved = BitmapFactory.decodeByteArray(data, 0, data.length);
                Bitmap loaded = info.getIcon(mIconCache);
                needSave = !saved.sameAs(loaded);
            } else {
                needSave = true;
            }
        } catch (Exception e) {
            needSave = true;
        }
        if (needSave) {
            Log.d(TAG, "going to save icon bitmap for info=" + info);
            // This is slower than is ideal, but this only happens once or when the app is updated with a new icon.
            updateItemInDatabase(context, info);
        }
    }

    /**
     * Return an existing FolderInfo object if we have encountered this ID previously,
     * or make a new one.
     */
    private static FolderInfo findOrMakeFolder(HashMap<Long, FolderInfo> folders, long id) {
        // See if a placeholder was created for us already
        FolderInfo folderInfo = folders.get(id);
        if (folderInfo == null) {
            // No placeholder -- create a new instance
            folderInfo = new FolderInfo();
            folders.put(id, folderInfo);
        }
        return folderInfo;
    }

    // m by zgy
  public static final Comparator<ApplicationInfo> getAppNameComparator() {
        final Collator collator = Collator.getInstance();
        return new Comparator<ApplicationInfo>() {
            public final int compare(ApplicationInfo a, ApplicationInfo b) {           	
//                int result = collator.compare(a.title.toString(), b.title.toString());
//                if (result == 0) {
//                    result = a.componentName.compareTo(b.componentName);
//                }
            	int  aId, bId, result;
            	aId = a.getSortId();
            	bId =  b.getSortId();
            	
            	if(aId > bId){
            		result = 1;
            		
            	}else if(aId < bId){
            		result = -1;
            		
            	}else{
            		result = a.componentName.compareTo(b.componentName);
            	}
                return   result ;
            }
        };
    }
    
    public static final Comparator<ApplicationInfo> APP_INSTALL_TIME_COMPARATOR = new Comparator<ApplicationInfo>() {
        public final int compare(ApplicationInfo a, ApplicationInfo b) {
            if (a.firstInstallTime < b.firstInstallTime) return 1;
            if (a.firstInstallTime > b.firstInstallTime) return -1;
            return 0;
        }
    };
    
    public static final Comparator<AppWidgetProviderInfo> getWidgetNameComparator() {
        final Collator collator = Collator.getInstance();
        return new Comparator<AppWidgetProviderInfo>() {
            public final int compare(AppWidgetProviderInfo a, AppWidgetProviderInfo b) {
                return collator.compare(a.label.toString(), b.label.toString());
            }
        };
    }
    
    static ComponentName getComponentNameFromResolveInfo(ResolveInfo info) {
        if (info.activityInfo != null) {
            return new ComponentName(info.activityInfo.packageName, info.activityInfo.name);
        } else {
            return new ComponentName(info.serviceInfo.packageName, info.serviceInfo.name);
        }
    }
    
    
    // zgy install time  sssssssssssss
    /**
    public static class ShortcutNameComparator implements Comparator<ResolveInfo> {
        private Collator mCollator;
        private PackageManager mPackageManager;
        private HashMap<Object, CharSequence> mLabelCache;
        
        ShortcutNameComparator(PackageManager pm) {
            mPackageManager = pm;
            mLabelCache = new HashMap<Object, CharSequence>();
            mCollator = Collator.getInstance();
        }
        
        ShortcutNameComparator(PackageManager pm, HashMap<Object, CharSequence> labelCache) {
            mPackageManager = pm;
            mLabelCache = labelCache;
            mCollator = Collator.getInstance();
        }
        
        public final int compare(ResolveInfo a, ResolveInfo b) {
			CharSequence labelA, labelB;
			ComponentName keyA = LauncherModel.getComponentNameFromResolveInfo(a);
			ComponentName keyB = LauncherModel.getComponentNameFromResolveInfo(b);

			Integer aValue = sortMap.get(keyA.getPackageName());
			Integer bValue = sortMap.get(keyB.getPackageName());

			if (aValue == null && bValue == null) {
				if (mLabelCache.containsKey(keyA)) {
					labelA = mLabelCache.get(keyA);
				} else {
					labelA = a.loadLabel(mPackageManager).toString();
					mLabelCache.put(keyA, labelA);
				}

				if (mLabelCache.containsKey(keyB)) {
					labelB = mLabelCache.get(keyB);
				} else {
					labelB = b.loadLabel(mPackageManager).toString();
					mLabelCache.put(keyB, labelB);
				}
				mCollator.compare(labelA, labelB);
				
			} else if (aValue == null || bValue == null) {
				if (aValue == null)
					return -1;
				else {
					return 1;
				}
			} else if (aValue != null && bValue != null) {
				if (aValue > bValue)
					return 1;
				else {
					return -1;
				}
			}
			return 0;
		}
    };
    **/
    
    public static class WidgetAndShortcutNameComparator implements Comparator<Object> {
        private Collator mCollator;
        private PackageManager mPackageManager;
        private HashMap<Object, String> mLabelCache;
        WidgetAndShortcutNameComparator(PackageManager pm) {
            mPackageManager = pm;
            mLabelCache = new HashMap<Object, String>();
            mCollator = Collator.getInstance();
        }
        public final int compare(Object a, Object b) {
            String labelA, labelB;
            if (mLabelCache.containsKey(a)) {
                labelA = mLabelCache.get(a);
            } else {
                labelA = (a instanceof AppWidgetProviderInfo) ? ((AppWidgetProviderInfo) a).label : ((ResolveInfo) a).loadLabel(mPackageManager).toString();
                mLabelCache.put(a, labelA);
            }
            if (mLabelCache.containsKey(b)) {
                labelB = mLabelCache.get(b);
            } else {
                labelB = (b instanceof AppWidgetProviderInfo) ? ((AppWidgetProviderInfo) b).label : ((ResolveInfo) b).loadLabel(mPackageManager).toString();
                mLabelCache.put(b, labelB);
            }
            return mCollator.compare(labelA, labelB);
        }
    };

   public void dumpState() {
        Log.d(TAG, "mCallbacks=" + mCallbacks);
        ApplicationInfo.dumpApplicationInfoList(TAG, "mAllAppsList.data", mBgAllAppsList.data);
        ApplicationInfo.dumpApplicationInfoList(TAG, "mAllAppsList.added", mBgAllAppsList.added);
        ApplicationInfo.dumpApplicationInfoList(TAG, "mAllAppsList.removed", mBgAllAppsList.removed);
        ApplicationInfo.dumpApplicationInfoList(TAG, "mAllAppsList.modified", mBgAllAppsList.modified);
        
        if (mLoaderTask != null) {
            mLoaderTask.dumpState();
        } else {
            Log.d(TAG, "mLoaderTask=null");
        }
    }
}
